Choose the compound below that contains at least one polar covalent bond, but is

Question

Choose the compound below that contains at least one polar covalent bond, but is nonpolar A. HCN B. CF_4 C. SeBr_4 D. E. Both B and C are nonpolar and contain a polar covalent bond. An element E has the electron configuration [Ar] 4s^2 3d 4p^2. The formula for the fluoride of E is most likely: A. EF_14 B. EF_4 C. EF D. EF_6 E. EF_8 Nitrogen has five valence electrons. Which arrangement represents correct electronic configuration of N^- ion? List the following atoms in order of increasing first ionization energy: Li, Na, C, O, F. A. Li

Explanation / Answer

Answer to 8 is E. Nitrogen has total of 7 electrons of which 5 are valence elctrons... N^-- has 8 elctrons of which 6 are valence electrons ( means 2 nd shell electrons here). That strikes out options A,B,C. The degenerate orbitals (P orbitals) should be filled with one electron each and then be paired. That eliminates option D.

6 and 7 are blurry... Can't see anything there.. Please provide good image

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